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The two bricks of the same variety are overlapped face to face, the four corners are aligned, and one of the pieces is rotated, and the dimensions of the four sides are always the same. This method is especially suitable for the detection of smooth tiles.
Two bricks of the same variety are overlapped face to face, the four corners are aligned, and one of them is rotated, and the rotation is easy to be of poor quality, and vice versa. This method cannot be used to detect antique bricks. The distinguishing feature of antique bricks is the arbitrary change of surface color and pattern, and the surface can be uneven.
The amount of water absorption is an important indicator of the quality of the tile. Pour a small glass of water on the back of the brick. The faster the water disappears, the higher the water absorption rate, the looser the texture, the weaker the strength, and vice versa.
This is an important indicator for testing the quality of polished tiles. The protective wax on the surface of the polished tile is cleaned with a soft cloth or reagent, placed in a light or sunlight, and viewed at an oblique angle of 45 degrees. The brighter the surface, the better.
When tapping with a hard object, the crisper the sound, the higher the degree of porcelain and the better the quality. You can also use the left thumb, forefinger and middle finger to clip the corner of the tile and hang it down easily. Use your right index finger to tap the middle and lower part of the tile. For example, the sound is clear and pleasing to the top, such as dull sound and turbidity.